<!DOCTYPE html>
<html lang="en">
    <head>
        <title></title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <link href="css/common.css" rel="stylesheet">
        <style>
            .panel{
                width: 500px;
                height: 400px;
                background: #cccccc;
                margin: 0 auto;
            }
            .foot{
                width: 100%;
                height: 35px;
                background: #000000;
            }
        </style>
    </head>
    <body>
        <div class="panel" >
            
        </div>
        
    </body>
    <script type="text/javascript" src="js/chp12-1.js">
        
    </script>
</html>